All of the following are bacterial diseases except:
Correct answer: D. Poliomyelitis
- A. Cholera
- B. Tuberculosis
- C. Typhoid
- D. Poliomyelitis
Explanation
Option A: cholera is caused by a bacterium called Vibrio cholera (hence incorrect). Option B: tuberculosis is also caused by a bacterium called Mycobacterium tuberculosis (hence incorrect). Option C: typhoid is also caused by a bacterium called Salmonella Typhi (hence incorrect). Option D: Poliomyelitis is caused by a virus called poliovirus that spreads from person to person and can infect a person's spinal cord, causing paralysis (can't move parts of the body).
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Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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